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Kokum Fruit Bar Development Via Response Surface Methodology (RSM)

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Kokum Fruit Bar Development Via Response Surface Methodology (RSM) Pritam Bafna et al Int. Journal of Engineering Research and Applications www.ijera.com ISSN : 2248-9622, Vol. 4, Issue 2( Version 1), February 2014, pp.223-230 RESEARCH ARTICLE OPEN ACCESS Kokum Fruit Bar Development via Response Surface Methodology (RSM). Pritam Bafna*, Mrs. N. Manimehalai Fruit and Vegetable Laboratory, Department of Food and Process Engineering, SRM University, Kattankulathur, India Abstract A response surface methodology (RSM) was used for the determination of optimum ingredients level to prepare kokum fruit bar. Kokum pulp was extracted using water extraction method at temperature (24.97ºC) and time (30.42 min). The effects of ingredients levels on sensory parameters like texture, overall acceptability and calcium content of the prepared fruit bar were studied by employing a Box- Behnken Design (BBD). During the experimental trials the pulp quantity is kept fixed. The coefficient of determination R² for texture, overall acceptability and calcium content were 0.8298, 0.9239 and 0.9842 respectively. Analysis of variable (ANOVA) performed on the experimental values showed that sugar and milk powder were the most important factors that affected characteristics of the kokum fruit bar as it exerted a highly significant influence (p < 0.05) on all the dependent variables. Based on surface and contour plots, optimum ingredients level for formation of kokum fruit bar were pulp, sugar, milk powder; 50g, 40g and 9.39g respectively. Key words: Kokum, Fruit Bar, Response Surface Methodology, Box- Behnken Design, Calcium, Optimization I. Introduction digestive drinks. Both birindi saar and kokum kadi Garcinia indica Choisy belonging to the are supposed to be digestive and to relieve gastric family Guttiferae (in the mangosteen) is an problems. As kokum is a highly under-utilized fruit, indigenous tree of India. It was originally found only it can be preserved by making it as a processed food in the western peninsular coastal regions and the to use it during off-season. (Krishnamurthy, adjoining Western Ghats in the states of Maharashtra, Ravindranath, B. 1982) Goa, Karnataka and Kerala, India as well as parts of Eastern India in the states of West Bengal, Assam 1.2 Objective of Research: and North Eastern Hill regions. Studies have shown Perishable nature of kokum and that the rind contains moisture (80.0 g/100 g), protein unavailability of the preserved product in the market (1%), tannin (1.7%), pectin (0.9%), Total sugars gave rise to this research. This study was planned (4.1%) and fat (1.4%). The seed is very rich in keeping in view the nutritional importance of kokum stearic, oleic and stearic triglycerides Phytochemical and to utilize it by preserving as Fruit bar. This studies have shown that when compared with any kokum fruit bar provides both nutritional and other natural sources, kokum rind contains the phytochemical benefits to human population. Also its highest concentration of anthocyanins (2.4 g/100 g of industrial application will help to catch worldwide kokum fruit) (Nayak, Rastogiet al., 2010;Nayak, consumers of kokum. Srinivas, et al., 2010). The anthocyanins cyanidin-3- glucoside and cyanidin-3-sambubioside are the major II. Materials and Methods pigment present in kokum and is reported to occur in 2.1 Collection of Fruits the ratio of 4:1. Studies have shown that (-)- Salt rubbed kokum rinds (completely blackish red in hydroxycitric acid (HCA) is the major organic acid in colour) sugar and cumin powder were purchased kokum leaves and rinds. from a local shop in Parrys Market, Chennai. In summer the ripe rinds are ground in a blender with sugar and cardamom and consumed as a 2.2 Methodology cooling drink. Addition of kokum is supposed to Fruit bar was prepared by drying the boiled enhance the taste of coconut-based curries and to kokum pulp with addition of sufficient quality of remove the unpleasant smell of mackerel and sugar and other ingredients. The process involves in sardines. They are also used in some vegetable dishes fruit bar preparation is shown in Fig 1. and to prepare chutneys and pickles. The Goans regularly prepare kokum kadi or birinda solkadhi. This curry is used with rice or like an after meal www.ijera.com 223 | P a g e Pritam Bafna et al Int. Journal of Engineering Research and Applications www.ijera.com ISSN : 2248-9622, Vol. 4, Issue 2( Version 1), February 2014, pp.223-230 Formation of kokum pulp samples was used for each treatment. Equal amount (100ml) of water was added to the washed rinds. The washed rinds were soaked in water at 24.97°C temperature for 30.42 min of time. The kokum pulp Preparation of sugar syrup (65°brix) was extracted by grinding into the mixer operated at 5000 rpm for 5 min at controlled room temperature (28-32 °C). After extracted, the pulp was strained Addition of pulp to sugar syrup through 20 mesh stainless steel sieve to get the smooth pulp. 2.3 Experimental Design Layout Addition of milk powder, Liquid glucose The levels of ingredients were selected based on basic trials. By keeping the pulp quantity constant as 50gmthe independent variables Heating the mixture (TSS 75°brix) considered were: Sugar quantity (40-60g) and milk powder quantity (5.0-15.0g). A two -variable (three levels of each variable) 3-level factorial design and a Pouring the mixture into aluminium greased tray response surface methodology (RSM) were used to understand the interactions of sugar and milk powder quantity on the texture overall acceptability and Drying into a tray drier (at 50°C, 62 hrs) calcium content of the prepared fruit bar in 13 runs (Table2.2), of which 4 were centre edge, four were factorial, and five were at centre point. Cutting into bar shapes (3 cm X 5 cm) Table 2.1 - Processing ingredients and their levels Ingredients Levels Sugar (g) 40, 50, 60 Packed into LDPE aluminium covers Milk powder (g) 5, 10, 15 Fig 1.Process of making Kokum Fruit Bar. 2.4 Fruit Bar Development Trials The fruit bar development trials were carried out and 2.2.1 Equipment used the responses observed also shown in the table 2.2 The laboratory scale mixer consists of two 2.4Determination of Sensory Parameters parts- Mixing jar and motor (Preethi Himaachal& Co. The sensory parameters of the prepared fruit Solan, India). A grinding blade made up of stainless bar samples like texture and overall acceptability steel (1.6 mm thick) with three cutting edges was were evaluated on the basis of 9 point hedonic scale used to grind the material in the jar. using B2 Monadic Test of sensory. The samples were 2.2.2 Extraction of Kokum Pulp given to 20 semi trained panel members. Purchased kokum rinds were washed in cold water three times for the removal of salt.100 g of the Table 2.2 - Effect of process variables on texture, overall acceptability and calcium content of prepared kokum fruit bar. Factor 1 Factor 2 Response 1 Response 2 Response 3 Sugar (g) Milk powder Texture Overall Ca content X (x ) (g) Acceptability (mg/100g) Run X2 (x2) (OA) 1 40 (-1) 10 (0) 8.52 8.69 94 2 50 (0) 10 (0) 8.34 8.5 92 3 60 (+1) 10 (0) 8.17 8.27 93 4 50 (0) 10 (0) 8.32 8.43 92 5 50 (0) 10 (0) 8.3 8.5 93 6 40 (-1) 5 (-1) 8.1 8.32 84 7 60 (+1) 5 (-1) 7.27 7.86 85 8 60 (+1) 15 (+1) 8.36 8.38 105 9 50 (0) 10 (0) 8.37 8.41 92 www.ijera.com 224 | P a g e Pritam Bafna et al Int. Journal of Engineering Research and Applications www.ijera.com ISSN : 2248-9622, Vol. 4, Issue 2( Version 1), February 2014, pp.223-230 10 50 (0) 10 (0) 8.28 8.37 93 11 40 (-1) 15 (+1) 7.85 8.46 104 12 50 (0) 15 (+1) 8.47 8.23 105 13 50 (0) 5 (-1) 8.3 8.12 84 Liquid glucose = 2g x represents the coded level of variables; X represents the actual level of variables. 2.5 Calcium Content Determination 2.7Optimization Calcium is determined as calcium pectate. Numerical and graphical optimization was Pectin extracted from plant material is saponified carried out for the independent variables to obtain the with alkali and precipitated as calcium pectate from fruit bar with Maximum texture, Overall acceptability an acid solution by addition of calcium chloride. The scores and calcium content using Design-Expert calcium pectate precipitate is washed until free from software. Conventional graphical method was applied chloride, dried and weighed. to obtain Maximum pulp of all responses. Predictive models were used to graphically represent systems. 2.6 Statistical Analysis for Optimization of Contour plots of the response variables were utilized Ingredients Quantity to select optimum ingredients level of kokum pulp The response functions y (dependent sugar, milk powder quantity for the production of variables) were sugar quantity and milk powder kokum fruit bar. quantity. The following second-order polynomial model was fitted to the dependent variables with the III. Results and Discussions experimental data (Eq.1.1) 3.1 Statistical Analysis 2 2 (1.1) y =b0 + b1 X1 + b2 X2+ b12 X12 b12 X1 b22 X2 Table 3.1, summarizes the results of each dependent variable with their coefficients of determination (R²). The statistical analysis indicates The coefficients of the polynomial were that the proposed model was adequate, possessing no represented by b (constant term), b and b (linear 0 1 2 significant lack of fit and with very satisfactory effects), b and b (quadratic effects), and b 11 22 12 values of the R² for all the responses.
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